Heater and firebox therefor



May 2, 1933'. Q MAUL 1,907,077

HEATER AND FIREBOX THEREFOR Filed June 1'61; 1930 I Y 'INVENTOR BY K712 6%?11 zmcd-flfld/zdza? A TTORNEY Patented May 2, 1933 UNITED STATES P Er FFICE EENEY O. IVIA'UL, OF DETROIT, MICHIGAN, ASSIGNOR TO DETROIT MICHIGAN STOVE COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN HEATER AND FIREBOX THEREFOR Application filed June 16,

This invention relates to heaters and more particularly to gas heaters of the radiating type.

Heaters of this type, as generally provided in the past, have been double walled in construction, a fire box or the like being provided inside the casing enclosed by the inner wall, and there being burners disposed below or at about the level of the floor of the firebox. The products of combustion from these burners usually went into the fire box, and aroundthe ends of the latter, and from there to the flue provided in the upper portion of the inner casing of the heater.

It appears desirable for heaters of this type to provide means whereby. the fire box could be substantially entirely enclosed, and made of a heat and light-reflecting substance, such asfire brick, or clay, although this, at first glance, appears impossible because of the necessity of permitting the products of combustion to escape from the fire box. Accordingly, an object of this in-' vention is a fire box so formed as to be substantially entirely enclosed and made of a heat and light-reflecting substance, at the same time not interfering with the proper escape of the products of combustion.

A further object is a heater wherein the fire box ceiling is provided with perforationsthru which the products of combustion may escape to the flue.

r A still further object is 'a fire box having perforations in its ceiling, the latter being shielded so that the perforations are not visible from the front of the heater.

A still further object is a fire box formed of fire brick or clay, there being no cast iron or sheet metal parts in the fire box proper.

A still further object is a novel form of fire box, one which is provided with a multitude of heat and light reflecting projections on its inner surface, there being no dark spots visible in the fire box when the heater is viewed from the front, as is ordinarily done.

A still further object is a novel form of fire box, one which can be economically man- .ufactured and yet which possesses advanwall 11 into communication with the upper 1930. Serial No. 461,482.

tages of performance andbeauty not present in fire boxes heretofore provided.

Still further objects will readily occur to those skilled in the art upon reference to the following description and the accompanying drawing in" which Fig. 1 shows, in side View, a heater provided with the novel form of fire box, parts being shown in section. V

Fig. 2 is an enlarged view of a portion of the firebox ceiling.

Fig. 3 is a sectional detail of a modified form of fire box wall.

Fig. 4 is a partial front view ofthe form of Fig. 3.

As indicated in. the drawing, and more particularly in Fig. '1, the heater is provided with an outer wall 11 and an inner wall 12. The outer wall 11 is open'at the with a door 14: having panes of mica or heat resisting transparent material, not shown,

andwhich is hinged at 15. There isalso provided a flue 17 running thru the outer portion of the inner wall 12. Further, the, lower front portion of the outer wall 11, from the door 14; to the point 18, is also provided with openings 19 covered bypanes of mica or other heat resistant' transparent material not shown, so as to expose thefire box to view.

Disposed within the inner casing, is a fire box which forms the principal part of this invention and which will be described in detail as follows: The fire box includes a floor or base 20 supported upon suitable angles or the like 21, and so formed as to provide a gridiron or comb bottom, whereby a number of heat and light reflecting projections are provided, such as those indicated at 22. 7

At the back edge of the floor 20, is an element 23, which, together with the adjacent element 2% forms a combined back wall'and ceiling for thefire box and it will be understood that parts 23 and 24; may be made separately or integral, as desired. In the form shown in Fig. 1, they are made separate, ceiling 24 resting upon a ledge 25 of the back wall portion 23. Ceiling 24 is provided with a plurality of conical tips or nibs 27 small size and is further provided with a plurality of perforations 28 disposed. as shown, slightly behind the tips or nibs 27 so as to be shielded thereby from the observers view.

The fire box is also provided with end walls 29, only one of which is shown, and each ofthem is provided with conical tips or nibs 30. The 'fioor 20 back wall 23, ceiling 24 and end walls 29 form a complete fire box, open only on the front,'and at the perforations in the ceiling and under the floor.

Further, these parts are made of a material such as fire brick or fire resisting clay which is ordinarily of an extremely light color and which glow when heated, that is to say, when the flames are issuing from the burners 31, shown below the floor 20, so as to give an extremely pleasing appearance to the fire box.

It will be observed that the products of combustion escaping from the burners 31 thru the burner holes 32 pass thru the floor of the fire box 20 and to the flue 17 thru the apertures or perforations28 in the ceiling. It will also be observed that apertures or perforations 28 are not visible by the observer, his gaze being substantially in directions indicated by the arrows O of Fig. 1. Another form of ceiling and back wall is disclosed in Fig. 3, and in this form, the ceiling and back wall are made of one piece '36 which is disposed upon the angle 21 above the floor 20 in the manner heretofore described, its'upper edge being disposed against a corner of the inner casing 12. The ceiling 36, in this form also is provided with perforations 37 which are sub .stantially elongated, as shown in Fig. 4, and are concealed from view by the elon- .ther, the floor 20.need not be of the comb or gridiron form disclosed, since any other form may be used without departing from the spirit of this invention.

Now having described the invention and .the preferred embodiment thereof, it is to be understood that the said invention is to be limited, not to the specific details herein set forth and illustrated but only by the scope of the claims which follow:

firebox further having a front wall I claim: 7

-1. In a heater, a firebox having a trans parent front, burners adjacent the bottom of the firebox, a flue connected to the upper portion of the firebox, and a perforated reof flow of the products of combustion, the

box being free of parts in. the line of vision between the transparent front and the forward surface of said wall.

2. In a' heater, a firebox having a transparent front, burners adjacent the bottom of the firebox, a flue connected to the upper portion of the firebox, and aperforated refractory back wall forming a partition-between the firebox and the fiue, and thru which pass the products of combustion from the burners, the wall being behind the path of flow of the products of combustion, the

box being free of parts in the line of vision between the transparent front and the forward surface of said wall, the wallhaving' small projecting portions in front of and concealing the perforations.

3. A heater. having a fire box provided with a bottom wall, and ai'perforated, in-

clined, refractory, back and-ceiling wall, a

flue above the box and isolated therefrom by the refractory wall, and burners adjacent the bottom wall of said box and positioned to discharge products of combustion in front of said refractory wall, the prod-" ucts of combustion passing thru the perforations of said refractory wall on their way from the interior of the boxto the flue. v

4. A heater having a fire box provided with a bottom wall, and a perforated, in-" clined, refractory, back, and ceiling wall, a flue above the box and isolated therefrom by the refractory wall, and burners adjacent the bottom wall of said box and positioned to discharge products of combustion in front of said refractory wall, the products of combustion passing thru the perforations of'said refractory wall on their way from the interior of the box to the flue, the

ro-' vided with a view opening thru which the refractory wall may be viewed, there being nothing between the view opening and the wall but the productsof combustion passing, 1

in front of and thru the latter.

5. A heater having'a fire box provided with a bottom wall, and a perforated, inclined, refractory, back and ceiling wall, a flue above the box and isolated therefrom. v by the refractory wall, and burners adja cent the bottom wall of said box and positioned to discharge products of combustion in front of said refractory wall, the products of combustion passing thru the perfo-.

rations of said refractory on their'way from 30 the interior of the box to the flue, the refractory wall being provided with forwardly projecting portions adjacent and shielding the perforations.

6. A heater having a fire box provided with a bottom wall, and a perforated, inclined, refractory back and ceiling wall, a fine above the box and isolated therefrom by the refractory wall, and burners adjacent the bottom wall of said box and positioned to discharge products of combustion in front of said refractory wall, the products of combustion passing thru the perforations of said refractory wall 011 their way from the interior of the box to the flue, the firebox further having a front wall provided with a view opening thru which the refractory wall may be viewed, there being nothing between the view opening and the wall but the products of combustion passing in front of and thru the latter, the refractory wall being provided with forwardly projecting portions adjacent and shielding the perforations.

7. In a heater fire box, a perforated, inclined, back and ceiling wall of non-metallic refractory material provided with portions each of small size projecting forwardly therefrom adjacent, above, and in front of the perforations.

8. In a transparent front heater, a substantially enclosed fire box having a refractory, perforated back and ceiling wall, burners adjacent said box and positioned to emit products of combustion in front of said wall, the products of combustion passing thru the perforations thereof on their Way out of the fire box.

HENRY (l'MAUL. 

